test: decommission native e2e tests in favor of captain (#484)

Author: a7medev

example/android/app/build.gradle

@@ -70,10 +70,6 @@ flutter {
 }
 
 dependencies {
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test:rules:1.1.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
-    androidTestImplementation 'com.android.support.test.uiautomator:uiautomator:2.1.3'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation 'com.android.support:multidex:1.0.3'
     implementation 'org.mockito:mockito-core:1.10.19'